Auto White balance error E5

Not the first time I've had this "error". The white balance being way off.

I took a series of 40+ photos and all exhibited this blue cast.

Obviously a white balance situation. I noticed this blue cast in the first photo

that I took, so I turned the camera off, hoping that a reboot would set my Auto WB back to

normal. no such luck.

Approx 45 minutes later I went out again and took a series of photos, same camera, same lens

and the Auto WB was spot on. The only changes I'd made were shutter speed and f stop.

Anyone else have this happening?

Blue image shot approx 45 mins before the other one.